diff --git a/vllm/distributed/parallel_state.py b/vllm/distributed/parallel_state.py
index 4bb77146295af..9fceffe7cb88b 100644
--- a/vllm/distributed/parallel_state.py
+++ b/vllm/distributed/parallel_state.py
@@ -39,9 +39,9 @@
 
 
 def init_distributed_environment(
-    world_size: int,
-    rank: int,
-    distributed_init_method: Optional[str] = None,
+    world_size: int = -1,
+    rank: int = -1,
+    distributed_init_method: str = "env://",
     local_rank: int = -1,
     backend: str = "nccl",
 ):